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<b>DbEnv::memp_sync</b>
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<b><pre>
#include &lt;db_cxx.h&gt;
<p>
int
DbEnv::memp_sync(DbLsn *lsn);
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<b>Description: DbEnv::memp_sync</b>
<p>The DbEnv::memp_sync method flushes modified pages in the cache to their
backing files.</p>
<p>Pages in the pool that cannot be immediately written back to disk (for
example, pages that are currently in use by another thread of control)
are waited for and written to disk as soon as it is possible to do
so.</p>
<p>The DbEnv::memp_sync method
either returns a non-zero error value
or throws an exception that encapsulates a non-zero error value on
failure, and returns 0 on success.
</p>
<b>Parameters</b> <br>
 <b>lsn</b><ul compact><li>The purpose of the <b>lsn</b> parameter is to enable a transaction
manager to ensure, as part of a checkpoint, that all pages modified by
a certain time have been written to disk.
<p>All modified pages with a a log sequence number (<a href="../api_cxx/lsn_class.html">DbLsn</a>) less
than the <b>lsn</b> parameter are written to disk.  If <b>lsn</b> is
NULL, all modified pages in the pool are written to disk.</p></ul>
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<br><b>Class</b>
<a href="../api_cxx/env_class.html">DbEnv</a>, <a href="../api_cxx/mempfile_class.html">DbMpoolFile</a>
<br><b>See Also</b>
<a href="../api_cxx/memp_list.html">Memory Pools and Related Methods</a>
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